TAJO-1025: Network disconnection during query processing can cause infinite exceptions. (Jihun Kang via jinho)
TAJO-983: Worker should directly read Intermediate data stored in localhost rather than fetching. (Mai Hai Thanh via hyunsik)
TAJO-1070: BSTIndexScanExec should not seek a negative offset. (jinho)

Closes #159
TAJO-1060: Apply updated hadoop versions to README and BUILDING files. (jinho)

Closes #158
TAJO-1061: Update build documentation. (jaehwa)

Closes #157
TAJO-1078: Update contributor list.

Closes #165
TAJO-1074: Query calculates wrong progress before subquery init. (jinho)

Closes #162
TAJO-962: Column reference used in LIMIT clause incurs NPE.

Closes #164
TAJO-981: Help command (\?) in tsql takes too long time. (YeonSu Han via jaehwa)

Closes #174
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-1068
Reflected Mai and Henry's comments.